Ni micro-alloyed steel for petroleum drill collar and preparation method thereof

A micro-alloying and oil drilling technology, applied in the field of oil drilling steel, can solve problems such as complex drilling and production environment, and achieve the effects of process optimization, stability assurance, and high service life

Active Publication Date: 2016-10-26
SHANDONG IRON & STEEL CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent years, the drilling and production environment has become more complex and harsh, requiring drill collars to work under more severe conditions, and putting forward higher requirements for their compressive strength, impact toughness and corrosion resistance

Method used

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  • Ni micro-alloyed steel for petroleum drill collar and preparation method thereof
  • Ni micro-alloyed steel for petroleum drill collar and preparation method thereof
  • Ni micro-alloyed steel for petroleum drill collar and preparation method thereof

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Embodiment 1-3

[0025] The preparation method of Ni microalloyed petroleum drill collar steel of the present invention comprises the following steps:

[0026] (1) Smelting

[0027] EBT ultra-high power 100-ton electric furnace is used for smelting. In order to effectively reduce the content of inclusions in steel, the amount of molten iron added in electric furnace smelting should be increased to more than 60%. High-phosphorus and high-sulfur scrap steel can only be smelted when the furnace body is in good condition, so as to ensure the best furnace condition and reduce the increase of gas content in the steel due to furnace body factors. The whole process of electric furnace smelting maintains foamy slag operation, uniform decarburization, reduces nitrogen absorption, and uses large amount of slag for deep decarburization to strengthen P removal, and the control end point [P]≤0.008wt%. High-temperature rapid decarburization, the control end point [C]≥0.10wt%, and the content of other residu...

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Abstract

The invention discloses a Ni micro-alloyed steel for a petroleum drill collar and a preparation method of the Ni micro-alloyed steel. The Ni micro-alloyed steel for the petroleum drill collar comprises, by mass, 0.40%-0.48% of C, 0.15%-0.35% of Si, 1.00%-1.20% of Mn, 1.05%-1.30% of Cr, 0.20%-0.35% of Mo, 0.20%-0.40% of Ni, no more than 0.015% of P, no more than 0.010% of S and the balance iron and inevitable impurity elements. The preparation method of the Ni micro-alloyed steel comprises the procedures of smelting conducted through an electric furnace, external refining conducted through a ladle furnace, vacuum treatment conducted through a vacuum degassing furnace, continuous casting and rolling. The Ni micro-alloyed steel for the petroleum drill collar has good comprehensive mechanical performance and stable hardenability, and heat treatment stability is guaranteed. Because micro-alloying is achieved through the added Ni, the low-temperature impact toughness of the Ni micro-alloyed steel is improved.

Description

technical field [0001] The invention relates to the field of steel for oil drilling, in particular to a steel for oil drill collars with medium carbon CrMnMo added with a small amount of Ni for microalloying, good comprehensive mechanical properties and low-temperature impact toughness, and a preparation method thereof. Background technique [0002] Drill collar is one of the most important components of oil and natural gas drill strings. It can provide drilling pressure to the drill bit and improve the rigidity of the drill string. It can withstand high-speed rotation in drilling operations, severe friction with rocks, and large torque. (Drilling depth should reach more than 3 kilometers, and drill collars should be connected joint by joint) and various alternating stresses such as impact force when starting and stopping. With the continuous development of my country's oil and gas industry, the demand for oil drill collars as an indispensable drilling tool in oil drilling o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
CPCC22C38/02C22C38/04C22C38/08C22C38/12C22C38/18
Inventor 欧阳峥容刘兵翟正龙闻小德戈文英郑桂芸
Owner SHANDONG IRON & STEEL CO LTD
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